package com.hedl.practice.diyJava.reflex.study_01;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Scanner;

public class ReflectionTest {
    public static void main(String[] args) {
        String name;
        if (args.length > 0){
            name = args[0];
        }else {
            Scanner in = new Scanner(System.in);
            System.out.println("输入一个类名(e.g.java.util.Date)：");
            name = in.next();
        }

        try {
            Class c1 = Class.forName(name);
            Class superC1 = c1.getSuperclass();
            String modifiers = Modifier.toString(c1.getModifiers());
            if (modifiers.length() > 0){
                System.out.print(modifiers+" ");
            }
            System.out.println("class "+name);
            if (superC1 != null && superC1 != Object.class){
                System.out.print(" extends "+superC1.getName());
            }
            System.out.println("\n{");
            printConstructors(c1);
            System.out.println();
            printMethods(c1);
            System.out.println();
            printFields(c1);
            System.out.println("}");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        System.exit(0);
    }

    /**
     * 打印Class的所有属性
     * @param c1
     */
    private static void printFields(Class c1) {
        Field[] fields = c1.getDeclaredFields();
        for (Field f : fields) {
            Class type = f.getType();
            System.out.print("   ");
            String modifiers = Modifier.toString(f.getModifiers());
            if (modifiers.length() > 0){
                System.out.print(modifiers+" ");
            }
            System.out.println(type.getName()+" "+f.getName()+";");
        }
    }

    /**
     *打印Class的所有方法
     * @param c1
     */
    private static void printMethods(Class c1) {
        Method[] methods = c1.getDeclaredMethods();
        for (Method m : methods) {
            Class retType = m.getReturnType();
            System.out.print("  ");
            String modifiers = Modifier.toString(m.getModifiers());
            if (modifiers.length() > 0){
                System.out.print(modifiers +" ");
            }
            System.out.print(retType.getName()+" "+m.getName()+" (");
            Class[] paramTypes = m.getParameterTypes();
            for (int i = 0; i < paramTypes.length; i++){
                if (i > 0){
                    System.out.print(",");
                }
                System.out.print(paramTypes[i].getName());
            }
            System.out.println(");");
        }
    }

    /**
     * 打印Class对象的所有构造方法
     * @param c1
     */
    private static void printConstructors(Class c1) {
        Constructor[] constructors = c1.getDeclaredConstructors();
        for (Constructor c : constructors) {
            String name = c.getName();
            System.out.print("    ");
            String modifiers = Modifier.toString(c.getModifiers());
            if (modifiers.length() > 0){
                System.out.print(modifiers+" ");
            }
            System.out.print(name+"(");
            Class[] paramTypes = c.getParameterTypes();
            for (int i = 0; i < paramTypes.length; i++){
                if (i > 0){
                    System.out.print(",");
                }
                System.out.print(paramTypes[i].getName());
            }
            System.out.println(");");
        }
    }
}
